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 Question on multiple joins		  New Topic  Reply to Topic
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darms21
Yak Posting Veteran

53 Posts
Posted - 04/24/2012 :  10:58:02  Show Profile  Reply with Quote
I have a table called asset_owner which stores a serial number of an asset and an owner's name. I also have 2 additional tables called related_owner and related_user. How can I join the owner's name from asset_owner to related_owner if a match exist but use related_user if a match doesn't?
I want my output to have 2 columns...serialnumber and owner name.

Any ideas?

sunitabeck
Flowing Fount of Yak Knowledge

5152 Posts
Posted - 04/24/2012 :  11:08:25  Show Profile  Reply with Quote
Would need to join the three tables, and use coalesce:
SELECT
	ao.serialnumber,
	COALESCE(ao.owner_name,ro.name,ru.name) AS OwnerName
FROM
	asset_owner ao
	LEFT JOIN related_owner ro ON ro.serialnumber = ao.serialnumber
	LEFT JOIN related_user ru ON ru.serialnumber = ao.serialnumber;
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vinu.vijayan
Posting Yak Master

India
227 Posts
Posted - 04/27/2012 :  06:25:42  Show Profile  Reply with Quote
If Sunita's Query is not what you are looking for then please be more elaborate about your requirement.

N 28° 33' 11.93148"
E 77° 14' 33.66384"
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